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Formatted Integer With Specified Number Of Digits

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  Formatted Integer With Specified Number Of Digits Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-19 07:26 +0000
    Re: Formatted Integer With Specified Number Of Digits Gilmeh Serda <gilmeh.serda@nothing.here.invalid> - 2025-10-19 09:17 +0000
    Re: Formatted Integer With Specified Number Of Digits songbird <songbird@anthive.com> - 2025-10-19 10:01 -0400
      Re: Formatted Integer With Specified Number Of Digits Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-19 21:39 +0000
    Re: Formatted Integer With Specified Number Of Digits Paul Rubin <no.email@nospam.invalid> - 2025-10-24 01:14 -0700
      Re: Formatted Integer With Specified Number Of Digits Alan Bawden <alan@csail.mit.edu> - 2025-10-24 06:38 -0400

#197567 — Formatted Integer With Specified Number Of Digits

Formatting an integer with 3 digits, excluding base specifier:

    >>> "%#0.3x" % 2
    '0x002'

No equivalent to this in any of the other ways that Python allows for
formatting:

    >>> format(2, "#03x")
    '0x2'

    (Not what I want)

    >>> format(2, "#0.3x")
    Traceback (most recent call last):
      File "<python-input-10>", line 1, in <module>
        format(2, "#0.3x")
        ~~~~~~^^^^^^^^^^^^
    ValueError: Precision not allowed in integer format specifier

    >>> "{:#03x}".format(2)
    '0x2'

    (Not what I want)

    >>> "{:#0.3x}".format(2)
    Traceback (most recent call last):
      File "<python-input-13>", line 1, in <module>
        "{:#0.3x}".format(2)
        ~~~~~~~~~~~~~~~~~^^^
    ValueError: Precision not allowed in integer format specifier

Why not?

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#197568

On Sun, 19 Oct 2025 07:26:44 -0000 (UTC), Lawrence D’Oliveiro wrote:

> Why not?

I have no idea

you could try zfill:

>>> f"magic number: {'42'.zfill(4)}"
'magic number: 0042'

>>> f"magic number: {str(42).zfill(4)}"
'magic number: 0042'

more info:
https://fstring.help/cheat/

-- 
Gilmeh

Necessity is a mother.

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#197569

Lawrence D’Oliveiro wrote:
> Formatting an integer with 3 digits, excluding base specifier:
>
>     >>> "%#0.3x" % 2
>     '0x002'
>
> No equivalent to this in any of the other ways that Python allows for
> formatting:
>
>     >>> format(2, "#03x")
>     '0x2'
>
>     (Not what I want)
>
>     >>> format(2, "#0.3x")
>     Traceback (most recent call last):
>       File "<python-input-10>", line 1, in <module>
>         format(2, "#0.3x")
>         ~~~~~~^^^^^^^^^^^^
>     ValueError: Precision not allowed in integer format specifier
>
>     >>> "{:#03x}".format(2)
>     '0x2'
>
>     (Not what I want)
>
>     >>> "{:#0.3x}".format(2)
>     Traceback (most recent call last):
>       File "<python-input-13>", line 1, in <module>
>         "{:#0.3x}".format(2)
>         ~~~~~~~~~~~~~~~~~^^^
>     ValueError: Precision not allowed in integer format specifier
>
> Why not?


  https://github.com/tpauldike/printf


  songbird

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#197570

On Sun, 19 Oct 2025 10:01:16 -0400, songbird wrote:

> Lawrence D’Oliveiro wrote:
>>
>> Formatting an integer with 3 digits, excluding base specifier:
>>
>>     >>> "%#0.3x" % 2
>>     '0x002'
>>
>> No equivalent to this in any of the other ways that Python allows for
>> formatting:
>>
>> Why not?
> 

We already have printf-style formatting in Python, that’s what I was using 
above.

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#197571

Lawrence D’Oliveiro <ldo@nz.invalid> writes:
>     >>> "%#0.3x" % 2
>     '0x002'

f'0x{2:03x}

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#197572

Paul Rubin <no.email@nospam.invalid> writes:

   Lawrence D’Oliveiro <ldo@nz.invalid> writes:
   >     >>> "%#0.3x" % 2
   >     '0x002'

   f'0x{2:03x}

Won't work for negative numbers.

-- 
Alan Bawden

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